just look at the file you've got. Count how many bytes it has, I want to support multiple passes, to make sure it was read the first time. That is, "verify" won't see a short file, but the whole file size.

Also, I want to be able to allocate the entire file size ahead of time, to make sure it fits in the destination.

I assume you are able to tell the remote store to skip some amount of bytes before starting the transfer back up, right? Right, just seek.

—John